Cylinder-reboring machine



AS N0. 6096 Jan; 8, 1924. 1,480,254

F. T. FLINCHBAUGH CYLINDER REBORING MACHINE Filed Feb. 8. 1921 5 Sheets-Sheet 5 Patented Jan. 8, 1924.

TED ST A T E S FREDERICK '1. FLINGHBAUGH, OF YORK, PENNSYLVANIA.

crmnnnn-nnnonnve MACHINE.

Application filed February 8, l9 21. SerialNo. 443,392.

To all whom it may concern:

Be it known that I, Fnnnnnioii T. VFLINCH- 13A UUH, citizen or the United States, residing at York, in the county oi York and State of Pennsylvania, have invented certain new and useful Improvements in Cylinder-Reboring Machines, of which the following is a specification.

This invention relates to an improved reboring tool for engine cylinders and has as. one of its principal'objectsto provide a convenient and easily manipulated device of this character which may be readily attached to ail-engine block for selectively reboring the cylinders thereof.

The invention has asa further object to provide aimachine embodying an improved t'eedingniechanism wherein the rate offeed of the cutter employed may be readily varied'ior a constant rate of rotation ofthe boring bar. 7

A further object of the invention is to provide a machine employing a'separable base and gear case, wherein the base may be attached to an engine block for supporting the machine, centered with respect to any one of the cylinders of the block selectively and wherein the gear case may be detached from the base for removing the cutter, this construction providing an arrangement whereby the centering of the base will not be molested so that by simplyreplacing the gear case upon the base, work upon the cylinder may be continued.

And the invention has as a still further object to provide a machine wherein the cutter may be mechanically withdrawn from the cylinder into the base so that the gear case and cutter may subsequently be removed with ease.

Other and incidental objects will appear hereinafter.

In the drawings: c

Figure 1 is a fragmentary side elevation of my improved reboring machine.

FigureQ is an enlarged sectional View of the device, showing the machine in position upon an engine block or conventional construction,

Figure 3 is a View similar to Figure 2, showing themanner in which the cutter may bemechanically retracted within the base of the machine,

Figure 4: is a transverse section on the line i of Figure 2, looking in the direction of 16 arrows,

Figure 5' is a transverse section on the line Figure 71 is an enlarged detail section showing the mounting of the feed dogs employed, and v F igure'S is a detail plan View of the upper end'otthe boring bar. i

In carrying the invention into effect, I employ a cylindrical base 1O -provided i inopposite sides thereof with sight openings 11 and formed atits vlower end with a plurality of projecting lugs 12 by, which the base may be'bolte'd to an engine block. In the drawings, IhaVe conventionally shown an engine block at 13 and one of the cylinders oftheblock at 14, Formed'on the base at its upper end are oppositely disposed ears l5.

Matingwith the base is a cylindrical gear case 16' upon the'bottom' wallv of which is formed an annular boss or shoulder, 17 snugly fitting: within the base and centering the gear case with respect thereto. Projectingfrom thegear case at opposite sides thereofare oppositely disposed ears 18 registering with theears 15 and freely fitted through the cars 18 to be threaded through the ears 15 are cap bolts 19 'detachably con necting the gear case with the base. Closing the gear case is a cap plate 20 detachably secured in position'by a plurality of cap screws and formed on said plate axially thereof, is: an upstanding bearing 21. The bottomjwall of thegear ca seis provided with a similar bearing 22 and journalled through 'saidjbearings is a-boring bar 23flupon the lower end of which'is removably threaded a cutter 241:.- This cutter may be off any approved construction, the cutter forming no part of the present invention Formedin the boring b'ar throughout the major portion of its length is a longitudinally extendingarcuate channel 25 opening atone end through the upper end of the bar and terminating at itsopposite end near the lower end of theb'ar to define a (Web 26., Journaled at one end in said web is a feed screw 27 centered with respect to said channel and journaled at its opposite end throughacap plate 28which, as shown in detail iii-Figure 8, is screwed to theupperend 'ofthe bar, collars 29 being fined upon, the feed screw opposite vsides otsaid plate forfholding the screw against vertical movement. At its upper end the feed screw is formed with a squared terminal 30 and rising from the cap plate is a pin or post 31 with which is removably engaged a locking plate 32 fitting over the terminal 30 of the feed screw for holding said screw against rotation.

slidably surrounding the boring bar 23 within the gear case 16 is a bearing plate or ring 33 resting uponthe inner end of the bearing 22 and, as best shown in Figure 6, provided at one side with an arcuate lug 34 freely received within the channel 25 of the bar. slidably surrounding the bar above the plate 33 is a similar bearingvplate or ring 35 which, as shown in Figure 5, is provided at one side with an arcuate lug 36 similar to the lug 34 of the ring 33, the lug 36 being also freely received within the channel 25 of the boring bar. Confined between said bearing plates is a feed star 37 threaded upon the feed screw 2'7 and provided at its opposite sides with tubular trunnions or hub flanges 38 journaled through the lugs 34 and36 ofthe bearingplates. The feed star is, as best shown in Fi re 6, preferably provided with four teeth but the number of teeth employed upon the star may, of course, be varied. As will be perceived, when the boring bar is'rotated, the lugs of the bearing plates will 'coact with the bar to effect turning of the plates therewith so that the boring bar, the plates, the

feed screw, and feed star will revolve as a unit. Formed on the bearing 21. at one side thereof is a radially directed enlargement 39 from which extends on overhanging bear- 7 ing ,40 and extending through this bearing is a shaft 41, the inner end of which is journaled in a suitable opening in theadja cent side of the bearing 21. Fixed to the inner end portion of said shaft within the a enlargement is a beveled pinion 42 projecting into the gear case and holding the shaft against longitudinal movement is a collar 43, while with the outer-end portion of the shaft is removably engaged a crank 44. Resting upon the bearing plate 35 to coactwith the cap plate 20 of the gear case is a, beveled gear or pinion 45 meshing with the pinion 42. The gear 45 slidably rereceives the boring bar therethrough and, as best shown in Figure 4, is provided at one side with a key or boss 46 freely received within the channel 25 of the bar but coupling the gear with the bar so that when the gear is driven by turning of the crank 44, the bar will be rotated. As will be ob served, the boss 46 is cut away to freely accommodate the feed screw 27.

Integrally formed on the side wall of the gear case are spaced vertical reinforcing ribs 47 and threaded through adjacent ribs at opposite sides of the case are sleeves 48 lying in the plane of the feed star 37 and which may be adjusted radially with respect to the axis of the boring bar.

Threaded upon the outer end portions of said sleeves are nuts 49Iand slidable in said sleeves are pairs of feed dogs 50 provided at their inner ends with. flattened terminals 51 and having stems 52 slidably projecting.

inwardly. When the boring bar is rotated, the feed star 37 will, of course, travel in a circular path and, as will be noted, the terminals 51 of the feed dogs normally pro ject into said path for engagement with the teeth of the star, the Hat sides of said terminals being presented to the star teeth. In this position of the dogs, the pins 53 thereof are disposed in the laterally directed portions of the slots 54 in the guide sleeves 48 so that the dogsrwill thus be locked in I active position. dogs until the pins are brought into the longitudinally directed portions of said slots, the dogs may be retracted to inactive position and the dogs moved. to engage the pins. with the outer ends of the guide sleeves-L for holding the dogs so retracted. I

As will now be readily undersood in view of the preceding description, the crank 44 However, by rotating the may be turned for rotating the cutter 24.

Coincident-1y, the feed star 37 will engage the terminals 51 of the feed dogs-5O selectively to be rotated step by step by said dogs so that as the boring bar revolves, the cutter will be advanced into the cylinder 14, the feed screw 27 being held against individual rotation and thefeed star travel-- ing upon said screw longitudinally thereof;a

To vary the rateof feed of the boring bar for a constant rate of rotat-ionthereof, it is simply necessary to retract one or more of the feed dogs to inactive position in the manner previously explained. In reboring an engine cylinder it is quite often neces sary to remove the cutter sothat the progress of the wor; may be carefully inspected. To accomplish th1s ob ect, the crank 44 1S removed as is also the locklng plate A, crank 56 is, as shown in Figure 3, then engaged with the terminal 30 0f the feed screw and operated for counter-rotating the screw, the feed star 37 being moved to engage one of the feed dogs 50 to be held against rotation thereby. Consequently,

counter-rotation of the feed screw will,

cutter and, as will be noted, the cutter may be withdrawn to a position within the base it). Accordingly, by removing the cap bolts 19, the gear case 16 may be detached from the base for entirely removing the cutter, when access to the cylinder may be easily had. The cutter may, as will thus be seen, be removed from the cylinder without molesting the centering ofthe base 10 so that whenit is desired to complete the hering of the Cylinder, the gear case may simply be replaced upon the base when the cutter will be accurately centered with respect to the cylinder.

Having thus described the invention, what is claimed as new is:

1. A cylinder reboring machine including supporting means, a boring bar journaled thereon, a feed screw carried by the bar, bearing plates slidable upon the bar, a feed star upon the screw confined bet-ween said plates, and means upon the supporting means disposed to engage said star for advancing the bar upon rotation thereof.

2. A cylinder reboring machine including supporting means, a boring bar journaled thereon and provided with a channel, a feed screw jour'naled upon the bar extending within said channel, bearing plates slidable upon the *bar and having lugs projecting within the channel and connecting the plates to the bar to turn therewith, a feed star upon the screw having trunnions jounrnaled in said plates, and means upon the supporting means disposed to engage said star for advancing the bar upon rotation thereof.

3. A cylinder reboring machine including a gear case having top and bottom walls, a boring bar journaled through said walls, a feed screw upon the bar, bearing plates slid-able upon the bar, one of said plates coacting with the bottom wall, a feed star upon the screw confined between said plates, a drive gear slidable upon the bar but coupled therewith for driving the bar, said gear coacting with the other of said plates and the top wall of the gear case, and means upon the gear case disposed to engage said star for advancing the bar upon rotation thereof.

4:. A cylinder reboring machine including supporting means, a longitudinally movable boring bar journaled thereon, a feed screw carried by the bar eccentricall thereof, feeding means rotatable on said screw for advancing the screw and bar longitudinally, means upon said supporting means to coact with the feeding means for rotating the feeding means when the bar is turned, and means for normally locking the feed screw against individual rotation.

5. A cylinder reboring machine including supporting means, a longitudinally movable boring bar journaled thereon, a feed screw carried by the bar eccentrically thereof, feedfeeding means rotatable on said "screw for advancing the screw and bar longitudinally, and means upon said supporting means to coact with the feeding means for rotating the feeding means when the bar is turned and adapted to lock said feeding means against individual rotation whereby the feed screw may be turned and the bar retracted.

7 A cylinder reboring machine including supporting means, a boring bar journaled thereon, feeding means carried by the bar, and dogsupon the supporting means nor mally disposed to selectively engage said feeding means for advancing the bar upon rotation thereof, the dogs being retractable to inactive position for varying the rate of feed of the bar for a constant rate of rotation thereof.

8. A cylinder reboring machine includin supporting means, a boring bar journale thereon, feeding means upon the bar, spring pressed dogs upon the supporting means normally disposed to selectively engage the feeding means for advancing the bar upon rotation thereof, the dogs being retractable to inactive position for varying the rate of feed of the bar for a constant rate of rotation thereof, and means for locking the dogs in retracted position.

9. In a cylinder reboring machine, the combination with a rotatable longitudinally movable boring bar, of supporting means for the bar. an eccentrically located feed screw carried by the bar, feeding means upon said screw disposed to travel in a circular path when the bar is rotated, and stationary means upon said supporting means disposed for engagement by said feeding means in its traveling movement for advancing the bar longitudinally upon rotation thereof.

10. In a cylinder reboring machine, the combination with a rotatable longitudinally movable boring bar, of supporting means for the bar, an eccentrically located rotatable feed screw carried by the bar, feeding means upon said screw disposed to travel in a circular path when the bar is rotated, stationary means upon said supporting means disposed for engagement by said feeding means in its traveling movement for advancing the bar longitudinally upon rotation thereof, and means coacting between the bar and screw at one end of the screw normally locking the screw against rotation during the feeding operation.

11. In a cylinder reboring' machine the combination with a rotatable longitudinally movable boring bar, of supporting means for the bar, feeding means mounted to travel with the bar in a circular path When the bar is rotated, and companion stationary ,means upon. said supporting means disposed for engagement by said feeding means in its traveling movement for advancing the bar upon rotation thereof and movable independently of each other to inactive position for varying the rate of such advance for a constant rate of rotation of the bar.

12. In a cylinder reboring machine, the combination with a rotatable longitudinally movable boring bar, of supporting means for the bar, a feed screw upon the bar, a feed star threaded to receive the screw therethrough but held against movement longitudinally of the screw, and means upon the supporting means disposed for engage-= ment by said star for advancing the bar upon rotation thereof.

In testimony whereof I an); my signature.

FREDERICK 'l. FLINCHBAUGH. [L 8-] 

